import numpy as np

def define_material_and_geometry():
    E = 210e9  # 杨氏模量 (Pa)
    Ixx = 8.3e-6  # 关于x轴的截面惯性矩 (m^4)
    Iyy = 8.3e-6  # 关于y轴的截面惯性矩 (m^4)
    J = 16.6e-6  # 截面的极惯性矩 (m^4)
    A = 0.01  # 截面面积 (m^2)
    R = 1.0  # 曲梁的弯曲半径 (m)
    theta = 2 * np.pi * 3 / 4  # 曲梁的角度 (两圈螺旋)
    h = 0  # 螺旋高度 (m)
    return E, Ixx, Iyy, J, A, R, theta, h
